Multifunctional iridium dendrimers containing peripheral carbazole/arylamine unit and/or phosphine oxide group for solution-processed electrophosphorescence
Source abstract
Abstract
Abstract The design and synthesis of four novel iridium (III) complexes, (Cz)2Ir(pic), (TPA)2Ir(pic), (PO-Cz)2Ir(pic) and (PO-TPA)2Ir(pic) carrying a hole-transporting carbazole/arylamine group, and/or an electron-transporting phosphine group, were reported on the base of iridium (III) [bis(4,6-difluorophenyl)pyridinato-N,C2]picolinate (FIrpic). The relationships between structures and characterization of four Ir complexes were shown. A few of phosphorescent organic light emitting diodes (PHOLED) doped with four Ir complexes were fabricated, and device using FIrpic with a 10 wt% doping ratio was also afforded for comparison. The bluish green device with (Cz)2Ir(pic) gave highest efficiencies with a maximum current efficiency (CEmax) of 34.7 cd/A, a maximum power efficiency (PEmax) of 20.5 lm/W and a maximum external quantum efficiency (EQEmax) of 11.8%, respectively. Notably, the efficiency roll-off decreases more slowly for (Cz)2Ir(pic) based device than those for other Ir complexes. The slow efficiency roll-off may be ascribed to simplification of electron injection of transportation for (Cz)2Ir(pic).
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Organic Light-Emitting Diodes Research · Conducting polymers and applications · Organic Electronics and Photovoltaics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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